In my experience Moraby Moles near Camp Horizon were great for duoing at level 16.
Dodos are great fodder for a mage/melee duo from R8-R15. Grab Roselings for landptrap leaves and growth formula alpha. Kill beatles for fire crystals. Suggested camps: Camp Bearded Rock, Camp Dry Bone, Skull Valley.
The exp on squirrels and puks and does etc in a party of 3-4 R15-R20 in Coerthas is pretty darn good. I suggest checking out this zone. Camp Glory FTW.
Duoing Jellyfish in Cassie Hollow near Camp Horizon at R18-20 as a melee/mage combo is good exp with good alchemist drops (Jellyfish Umbrellas and Jellyfish Cnida.
Edited, Oct 16th 2010 8:28pm by Olorinus